Title XVIII specifically provides that it shall not be construed to authorize any federal officer or employee to exercise any supervision or control over the practice of medicine or the manner in which medical services are provided, or over the selection, tenure, or compensation of any officer or employee of any institution, agency, or person providing health services; or to exercise any supervision or control over the administration or operation of any such institution, agency, or person.

Any individual entitled to benefits under title XVIII may obtain health services from any institution, agency, or person qualified to participate under title XVIII if such institution, agency, or person undertakes to provide the individual such services.

Title XVIII does not preclude any State from providing, or any individual from purchasing, or otherwise securing, other protection against the cost of any health services.